Offgridtec® AGM 260Ah 20HR 12V Solar Battery—Extremely Cycle-Resistant

The Offgridtec solar battery (MPN: 001006) is a sealed AGM battery designed for use in solar and hybrid systems, as well as other stationary 12V power systems. With a rated capacity of 260 Ah (20HR), maintenance-free AGM technology, and low self-discharge, it is suitable for both cyclic applications and standby operation in emergency power and UPS systems. The battery was specifically developed for applications that require a reliable power supply and high cycle life.

Reliable 12V energy storage for solar and emergency power applications

• AGM technology with a sealed, maintenance-free design
• 260 Ah capacity (20 HR) at 12 V system voltage
• Exceptionally cycle-resistant for regular charging and discharging cycles
• Low self-discharge of approx. 2–3% per month at 25 °C
• Suitable for solar, hybrid, UPS, and emergency power systems
• Up to 500 cycles at a 50% depth of discharge or up to 1,200 cycles at a 30% depth of discharge
• Robust ABS housing with M8 screw terminals
• Maintenance-free operation without the need to top off the electrolyte

AGM technology for stationary power applications

The battery utilizes proven AGM (Absorbent Glass Mat) technology. In this process, the electrolyte is bound within a glass fiber mat, eliminating the presence of free liquid electrolyte. This reduces maintenance requirements and enables safe operation in stationary energy systems. At the same time, the AGM design is characterized by low self-discharge and good current delivery. The materials used—including lead dioxide and lead plates, fiberglass separators, and a durable ABS housing—ensure a long-lasting design for the intended application.

Suitable for solar, UPS, and DC systems

The AGM 260Ah was specifically developed for applications in which energy is stored and regularly discharged. Typical applications include:

• Photovoltaic and off-grid solar systems
• Hybrid energy systems
• Uninterruptible power supplies (UPS)
• Emergency power supplies
• Telecommunications systems
• Alarm and security systems
• DC Power Supplies
• Automated technical systems

High capacity for demanding applications

With a capacity of 260 Ah according to the 20-hour standard (20HR), the battery provides large energy reserves for stationary loads. Depending on the discharge rate, the following capacities, among others, are available:

• 261.8 Ah (20HR)
• 250.0 Ah (10HR)
• 219.15 Ah (5HR)
• 135.51 Ah (1HR)

The battery has a low internal resistance of ≤ 2.8 mΩ (at 25 °C, fully charged), which allows it to reliably power even higher loads.

Charging and Service Life

For cyclic operation, a charging voltage of 14.40 to 14.60 V at 25 °C is recommended. In standby mode, the recommended float voltage is between 13.50 and 13.80 V. The maximum recommended charging current is 75 A, while the product page specifies a maximum charging current of 50 A. This difference should be verified before designing the charging system.

According to the manufacturer, the battery achieves:

• up to 500 charge/discharge cycles at a 50% depth of discharge
• up to 1,200 cycles at a 30% depth of discharge
• low self-discharge of approximately 2% per month (data sheet) or a maximum of 3% per month (store listing)

Technical Specifications

• System voltage: 12V DC
• Capacity (20HR): 261.8 Ah
• Capacity (10HR): 250.0 Ah
• Capacity (5HR): 219.15 Ah
• Capacity (1HR): 135.51 Ah
• Recommended charging voltage (cyclic): 14.40–14.60 V
• Trickle charge voltage: 13.50–13.80 V
• Max. charging current: 75 A (data sheet)
• Internal resistance: ≤ 2.8 mΩ
• Self-discharge: approx. 2% per month at 25 °C
• Connections: M8 screw terminals
• Housing material: ABS
• Dimensions (L × W × H): 520 × 269 × 220 mm
• Overall height: 224 mm
• Weight: approx. 74 kg
• Operating temperature (capacity reference): up to 40 °C according to the data sheet

Package Contents

1x Offgridtec® AGM 260 Ah 20 HR 12 V solar battery
M8 terminal screws

Battery Regulations

You are legally required to return batteries. After use, you can return them to our retail location or to a local municipal collection point.

Important Note According to the Battery Ordinance (BattV)

Regulation on the Take-Back and Disposal of Used Batteries. Batteries and rechargeable batteries do not belong in household trash. Consumers are legally required to return used batteries. Returns can be made at Offgridtec.com or at the municipality’s public collection points.

Pursuant to Section 10 of the Battery Act, the seller must collect a deposit of 7.50 euros, including sales tax, if the end consumer does not have a used starter battery at the time of purchase. If the seller does not collect a deposit—because the used battery was disposed of properly or an old-for-new exchange took place—this amount is also not deductible from the purchase price.